remove workaround for https://github.com/tessel/beta/issues/74
clean up tessel wait a bit (also baby step back to merging this and main lib)
move test code out of library and back into test.js
actually, split out tessel test code into own file
start testing read/write pipes, with tiny stream.Duplex stub
add workaround for https://github.com/tessel/beta/issues/207
add note about next bug…, https://github.com/tessel/beta/issues/209